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Fig. 1
Average X-ray burst light curve of 4U 1728–34 in the hard state observed by JEM-X1 (blue) in the 3–25 keV band and IBIS/ISGRI (20–40 keV in black and 40–50 keV in orange; right axis). The band between two vertical gray lines indicates the time range where the average X-ray burst spectrum was extracted.
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